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The total stellar mass in a cluster, plotted on the y-axis, is found to be proportional to the total mass of the cluster (shown on the x-axis). What is more surprising is that the proportionality does not seem to evolve with time (the 4 points in the Figure represent clusters at 4 different cosmic epochs). More theoretical studies are needed to understand the origin of such a lack of evolution of this scaling relation.

Subaru conducts latest population census of galaxy clusters

The metrology camera optics under tests in ASIAA

The first color image (M31) of HSC. (Picture Credit: National Astronomical Observatory of Japan)

The first color image (M31) of HSC_zoomed

The Prime focus instrument of PFS.

The first color image of HSC.

The FEU running with HSC installed

The FEU running with HSC during the observation

The HSC (Hyper SuprimeCam) installed on the Subaru telescope (top) with the FES attached (bottom).

Subaru Telescope Collaboration

Prime Focus Spectrograph (PFS) for Subaru Telescope

Subaru BVRIz composite color images centered on the galaxy cluster MACS1206 (z=0.439), overlaid with mass contours from our joint strong-and-weak lensing analysis of HST and Subaru observations. The image size in the left panel is 24 arcminutes (~8Mpc) on a side. The cluster is fairly centrally concentrated
in projection, and associated with elongated large scale structure running north-east south-east, both in the projected mass and galaxy distributions.

Mass Distribution in and around the Galaxy Cluster MACS J1206.2-0847

Subaru BRZ pseudo color image of the central 3'x3' region of the galaxy cluster CL0024+1654 (taken and modified from Umetsu et al. 2010, arXiv:0908.0069).

Lensing galaxy cluster CL0024+1654 (z=0.395)

Following the success of collaboration with CFHT, ASIAA started to work with Subaru telescope in 2008 in order to access to larger aperture telescopes. ASIAA has contributed to the wide field visible camera Hyper Suprime-Cam (HSC). It will be the largest format optical camera with 116 2kx4k CCD detectors covering a 1.5 degree field of view. This is a factor of 10 improvement over the existing Suprime Cam, and will have a total performance, as measured by the product of the aperture size and the field of view, which will exceed that of all other telescopes. The main scientific goal of the HSC will be the study of weak gravitational lensing over large areas of the sky. Approximately 2000 square degrees will be surveyed in 5 year period. From gravitational lensing, the total mass distribution (ordinary matter as well as dark matter) of clusters of galaxies will be surveyed. From the distribution of the clusters, the cosmic shear will be examined, and the role of dark energy to the acceleration of the Universe will be constrained.